The voice of Jesus informed David—as it instructed the apostles 2,000 yrs ahead of, “Freely you may have acquired; freely give.” As a result David hasn't charged for his time, training or any of the various supplies he gives away, but continues to be supported solely by love offerings. In https://www.youtube.com/playlist?list=PLXR6KmNsDBjSQgdIOJ1JFzHP8923tHwyl